Divergence of the thermal conductivity in uniaxially strained graphene

We investigate the effect of strain and isotopic disorder on thermal transport in suspended graphene by equilibrium molecular dynamics simulations. We show that the thermal conductivity of unstrained graphene, calculated from the fluctuations of the heat current at equilibrium, is finite and converg...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-03, Vol.87 (12), Article 125424
Main Authors: Pereira, Luiz Felipe C., Donadio, Davide
Format: Article
Language:English
Subjects:
Condensed matter
Divergence
Graphene
Heat transfer
Mathematical analysis
Phonons
Strain
Thermal conductivity
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Summary:We investigate the effect of strain and isotopic disorder on thermal transport in suspended graphene by equilibrium molecular dynamics simulations. We show that the thermal conductivity of unstrained graphene, calculated from the fluctuations of the heat current at equilibrium, is finite and converges with size at finite temperature. In contrast, the thermal conductivity of strained graphene diverges logarithmically with the size of the models, when strain exceeds a relatively large threshold value of 2%. An analysis of phonon populations and lifetimes explains the divergence of the thermal conductivity as a consequence of changes in the occupation of low-frequency out-of-plane phonons and an increase in their lifetimes due to strain.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.125424